The Supreme Court on Monday promised an extraordinarily thorough springtime review of President Barack Obama's historic health care overhaul — more than five hours of argument, unprecedented in modern times — in time for a likely ruling affecting millions of Americans just before the presidential election.

The Supreme Court said Monday it will hear arguments next March over President Barack Obama's health care overhaul — a case that could shake the political landscape just as voters are about to decide if Obama deserves another term.

A conservative law firm has asked the Supreme Court to strike down the health care overhaul, challenging the first federal appeals court ruling that upheld President Barack Obama's signature domestic initiative.